INFLUENCE OF RICE PADDY OPERATION ON RIVER WATER TURBIDITY

Abstract

This paper discusses the influence of fine sediment discharge from paddy field on the river water turbidity being based on filed measurements conducted in the Eai River catchment in 2014: The data of continuous turbidity measurement in a drainage channel were formulated into an empirical relation for suspended sediment flux using the mathematical quantification theory classⅡby taking the stages of paddy field operation and the rainfall intensity as the influential parameters. The results successfully explained the variation of turbidity in the river reach where the paddy field discharge is comparatively large not only for the data obtained in 2014 but also the data for the four years from 2010 to 2013.